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Diodes, one-way current conductors, are used for voltage regulation, AC/DC conversion, and circuit protection. Forward-biased at 0.6V, conduct current, reverse bias blocks it.
1N3716 tunnel diode header image: Caliston [Public domain]. Posted in Engineering , Hackaday Columns , Parts , Slider Tagged Gunn diode , negative resistance , Poulsen arc , Tunnel diode Search ...
The tunnel diodes we mentioned above are probably the best known devices that exhibit negative resistance, and there was a time in the early 1960s before transistors gained extra performance that ...
In forward mode, approximately 150 µA flows through the diode, causing D4 to be reverse-biased and holding comparator U1’s inverting input low. This turns off the red LED.
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